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Warehouse Receivables & Warehouse Lines of Credit - Summary of Warehouse Lines of Credit in Place (Parenthetical) (Detail) - Warehouse Agreement Borrowings [Member] - USD ($) |  | 1 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2019 | Jul. 31, 2019 | Feb. 01, 2020 | Aug. 01, 2019 | Jun. 30, 2019 | Apr. 01, 2019 | Feb. 27, 2019 | Jan. 31, 2019 | Dec. 31, 2018
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  |  | $ 2,850,000,000 |  |  |  | $ 2,600,000,000
Capital One [Member] | Pricing at daily one-month LIBOR plus 1.25%, maturing July 27, 2020 [Member] |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  |  | $ 700,000,000.0 | $ 200,000,000.0 | $ 200,000,000.0 | $ 200,000,000.0 | $ 325,000,000.0
Capital One [Member] | Subsequent Event | Pricing at daily one-month LIBOR plus 1.25%, maturing July 27, 2020 [Member] |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |
Maximum Facility Size |  | $ 200,000,000.0 |  |  |  |  |  |  |
Line of credit over LIBOR rate |  | 1.25% |  |  |  |  |  |  |
Current Maturity |  | Jul. 27, 2020 |  |  |  |  |  |  |
TD Bank [Member] | Pricing at daily one-month LIBOR plus 1.15%, maturing June 30, 2020 [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  | $ 400,000,000.0 |  |  |  |  |  |
TD Bank [Member] | Subsequent Event | Pricing at daily one-month LIBOR plus 1.15%, maturing June 30, 2020 [Member] |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  | $ 800,000,000.0 |  |  |  |  |
Line of credit over LIBOR rate | 1.15% |  |  |  |  |  |  |  |
Current Maturity | Jun. 30, 2020 |  |  |  |  |  |  |  |

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- Definition Warehouse receivables and warehouse lines of credit. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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